Build yourself a new calendar every month with this Perpetual Puzzle Calendar. Made of Lego style bricks, the numbered day bricks can be rearranged every month until the end of time (which might just be this coming December if you believe the Mayans). There’s even a few specialized bricks for birthday and holidays. You could even get a little creative and start your calendar week on a random day like say Thursday. Works for me, just don’t tell the Mayans.